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#15
04-13-2005, 08:32 AM
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Re: M-22 ???
Since you've already confirmed it's not an M-22, if you want to determine if it's an M-20, or M-21, simply count the teeth on the input shaft. 21 teeth = M-20, 26 teeth = M-21/22. The exception is the Early M-20 with 24 teeth.
(M-21, and M-22 have the same gear ratios). ALL M-22 regardless of the year should have a drain plug. ALL 70 up "661" cases have the drain plug regardless of ratio. ALL "661" boxes from 70 - 74 have 26 spline input shaft, and 32 spline output shaft. ALl info taken from www.gearzone.net
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Dennis 69 Nova 355, M-21, 3.90 12 bolt 68 Chevelle SS 396 4 sp 
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